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Welcome to AX84® the base camp for tube (valve) electronics hobbyists.

AX84 exists to provide:

1) A great environment to learn about music-related electronics in general. AX84 is a place where those with experience are interested in helping diligent beginners who are willing to do their homework.

2) A place where those with more experience can field their ideas to peers and get useful feedback.

3) An environment that respects the past, but is not enslaved by it. INNOVATION IS GOOD (and it didn't die in the 1950s.) There are new things under the sun every day. Move the ball forward!

Our HUGE discussion area is under 'Discussion Forum' to your left.

We are hard at work improving the site- check back often!

Recent Forum Threads
"Power tube heater filaments--wiring"
Posted By Caprotesta on 07/27/2014
Hi all,

Regarding power tubes: should heater filaments be wired in series or parallel? Could wiring them in series somehow affect bias current? ...

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"Heyboer Xformer"
Posted By Lou Glorfeld on 07/27/2014
I am completing a second HO build with options I started about four years ago. I have everything I need including all components and hardware but then noted that I had bought a Heyboer OT transformer....

Discuss this entry
Posted By barefootboy on 07/27/2014
It's been a few years since my last build and I'm missing something on this build. I used a Weber 5F2A schematic for the build. The power transformer is a P-TF22772 and the output transformer is a P-T...

Discuss this entry
"First Power up issue with voltage"
Posted By Bret Stone on 07/24/2014
Hi Everyone,

I finally finished my P1 Extreme kit, and I powered it on for the first time. Very Exciting! Well, I had it hooked into my speaker cab for a working load, and I started to see the 6L...

Discuss this entry
"Knowledge is Power - pun intended 'cause I think I'm funny"
Posted By BC Walter on 07/24/2014
I've been interested in electricity and electronics - specifically tube amps and circuits since I was a pup. I'm mechanically inclined and have mastered all the hands-on aspects of amp building. I'm...

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Updates: Sun, Jul 27th, 2014 @ 18:08:34
Updates to pages about


have been completed.
Site News

2012-2-25: Winter is almost over. What's on your workbench?

2011-10-10: Some good discussions about LTSpice in the forums again, as well as suggestions on what all to do to a P1-eXtreme.

2011-10-10: What all can you do with a P1-extreme? check the forum

2011-10-7: Don't forget to like us on Facebook!

2011-08-11: Posted some Single-Ended Lead clips in the Classic Amp Projects->SEL section. Hundreds built but now we've got clips. Check out the archived projects section for more clips.

2010-10-22: Be sure to check out our discussion forum using the link on the left..

2009-07-01: The Treasure Fleet is on the way to Rio De La Hacha with a fortune in gold!

We're looking for media clips of recent builds... please stop by the forum and respond to the thread.

2008-10-4: Archived Projects section is functional again.

2008-9-18: RSS Feeds for the forum have been up for a while, but not advertised...
* Active Threads
* New Threads
* Recent Posts

2008-6-26: Want to participate in our discussion forums? You are welcome to read and lurk as you like. If you think you'd like to post with regularity, please sign up for an account.

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